Sir Elton, 69, is has already started writing his memoirs, on which he will also work with music writer and critic Alexis Petridis.

The singer said he is finding the process of writing about his "roller coaster ride" of a life "cathartic", despite not being one to look back into the past.

He said: "I'm not prone to being a nostalgic person. I'm often accused of only looking forward to my next gig or creative project.

"It's come as quite a surprise how cathartic I am finding the process of writing my memoirs. As I look back, I realise what a crazy life I have had the extreme privilege of living.

Sir Elton added: "I have grown up in a period of extraordinary change in our world - and have had the joyful honour of rubbing shoulders and working with so many of the people at the heart of these changes.

"My life has been one helluva roller coaster ride and it's still lumbering on. I hope readers will enjoy the ride too."